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最新的 9i DBA 1Z0-007 免費考試真題:

1. Which three are true regarding the use of outer joins? (Choose three.)

A) In the WHERE condition, you use (+) following the name of the column in the table without matching rows, to perform an outerjoin.
B) You use an outerjoin to see only the rows that do not meet the join condition.
C) You cannot link a condition that is involved in an outerjoin to another condition by using the OR operator.
D) You cannot use IN operator in a condition that involves an outerjoin.
E) You use (+) on both sides of the WHERE condition to perform an outerjoin.
F) You use (*) on both sides of the WHERE condition to perform an outerjoin.

2. Which constraint can be defined only at the column level?

A) NOT NULL
B) CHECK
C) FOREIGN KEY
D) PRIMARY KEY
E) UNIQUE

3. The EMPLOYEES table contains these columns:

You need to write a query that will produce these results:
1.Display the salary multiplied by the commission_pct.
2.Exclude employees with a zero commission_pct.
3.Display a zero for employees with a null commission value.
Evaluate the SQL statement:
SELECT LAST_NAME, SALARY*COMMISSION_PCT
FROM EMPLOYEES
WHERE COMMISSION_PCT IS NOT NULL;
What does the statement provide?

A) All of the desired results
B) An error statement
C) Two of the desired results
D) One of the desired results

4. Examine the description of the EMPLOYEES table:

Which statement shows the maximum salary paid in each job category of each department?

A) SELECT dept_id, job_cat, MAX(salary)
FROM employees
GROUP BY dept_id;
B) SELECT dept_id, job_cat, MAX(salary)
FROM employees
GROUP BY dept_id, job_cat, salary;
C) SELECT dept_id, job_cat, MAX(salary)
FROM employees;
D) SELECT dept_id, job_cat, MAX(salary)
FROM employees
WHERE salary > MAX(salary);
E) SELECT dept_id, job_cat, MAX(salary)
FROM employees
GROUP BY dept_id, job_cat;

5. A SELECT statement can be used to perform these three functions:
1.Choose rows from a table.
2.Choose columns from a table
3.Bring together data that is stored in different tables by creating a link between them.
Which set of keywords describes these capabilities?

A) difference, projection, join
B) difference, projection, product
C) selection, intersection, join
D) selection, projection, join
E) intersection, projection, join

問題與答案：